package com.atguigu.eduservice.listener;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.atguigu.eduservice.entity.EduSubject;
import com.atguigu.eduservice.entity.excel.SubjectData;
import com.atguigu.eduservice.service.EduSubjectService;
import com.atguigu.oss.servicebase.exceptionhandler.GuliException;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;

/**
 * @author luomingliang
 * @date 2020/6/9 21:31
 */
public class SubjectExcelListener extends AnalysisEventListener<SubjectData> {

    //因为SubjectExcelListener不能交给spring进行管理,需要自己手动new, 不能注入其他对象
    //不能实现数据库操作
    public EduSubjectService subjectService;

    public SubjectExcelListener() {
    }

    public SubjectExcelListener(EduSubjectService subjectService) {
        this.subjectService = subjectService;
    }

    //读取excel中内容
    @Override
    public void invoke(SubjectData subjectData, AnalysisContext analysisContext) {
        if(subjectData == null) {
            throw new GuliException(20001, "文件数据为空");
        }
        //一行一行读取, 每次读取有两个值. 第一个值为一级分类,第二个值为二级分类
        EduSubject eduSubject1 = this.existOneSubject(subjectService, subjectData.getOneSubjectName());
        if(eduSubject1 == null) { //没有相同一级分类, 可进行添加
            eduSubject1 = new EduSubject();
            eduSubject1.setParentId("0");
            eduSubject1.setTitle(subjectData.getOneSubjectName());
            subjectService.save(eduSubject1);
        }

        //获取一级分类的id值
        String pid = eduSubject1.getId();

        EduSubject eduSubject2 = this.existTwoSubject(subjectService, subjectData.getTwoSubjectName() ,pid);
        if(eduSubject2 == null) { //没有相同一级分类, 可进行添加
            eduSubject2 = new EduSubject();
            eduSubject2.setParentId(pid);
            eduSubject2.setTitle(subjectData.getTwoSubjectName());
            subjectService.save(eduSubject2);
        }
    }

    //判断一级分类,不能重复添加
    private EduSubject existOneSubject(EduSubjectService subjectService, String name) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", "0");
        EduSubject oneSubject = subjectService.getOne(wrapper);
        return oneSubject;
    }

    //判断二级分类,不能重复添加
    private EduSubject existTwoSubject(EduSubjectService subjectService, String name, String pid) {
        QueryWrapper<EduSubject> wrapper = new QueryWrapper<>();
        wrapper.eq("title", name);
        wrapper.eq("parent_id", pid);
        EduSubject twoSubject = subjectService.getOne(wrapper);
        return twoSubject;
    }


    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {

    }
}
